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Troubleshooting | 7
9026381C Dual Top ST 6 _ 8 - OI 17 / 19
12. Drain all water contents.
13. Fill entire water supply system with fresh drinking water.
See chapter5, "Filling the boiler" on page 15 .
6.2 Descaling
Depending on the hardness of the water, used for heating in
the Dual Top ST, scaling and lime deposits can form in the
coolant hoses and the boiler. In order not to restrict the water
quality and the heater efficiency, it is advisable to conduct de-
scaling regularly depending on the water quality.
Use commercial descaling agents, such as citric acid-water mix-
ture or a wine vinegar-water mixture. Look in the manufac-
turer’s instructions for mixing ratios. Other products can harm
your health and/or the Dual Top ST.
1. Drain all water contents. See chapter4.7.1, "Draining the
boiler manually" on page 14".
2. Close all water taps.
3. Fill the entire water supply system with descaling agent.
4. Select Summer mode 40 °C to make sure the electrical
safety/drainage valve does not open.
5. Make sure that the boiler contains the mixture.
6. Open water taps in kitchen, bathroom, shower, etc. (set
preselecting mixing taps or single-lever valves to hot). Open
the taps one by one, not all at the same time.
7. Leave the water taps open until the Dual Top ST has been
vented of all air, the system is filled with descaling agent to
the point it is flowing out of the water taps. Then close the
taps.
8. Leave the Dual Top ST on for 1 to 2 hours and wait for the
reaction phase.
9. Verify whether the scale deposits have completely dissolved
in the descaling agent. If not, then run the heater for an-
other 30 minutes and then completely drain off the mixture
of descaling agent and water.
10. Flush the water supply system thoroughly with fresh drink-
ing water until fully clean and odorless.
11. Finally, fill the boiler with fresh drinking water again. See
chapter5, "Filling the boiler" on page 15.
7 Troubleshooting
7.1 Fault Message output
When a fault occurs, power indicator/fault indicator
(Dual Top ST 6: C/ Dual Top ST 8: 6) blinks RED.
Next to that, a fault message is shown on the display of the
control panel.
The meaning of the messages is shown in the table in
chapter7, "Troubleshooting" on page 17 .
Depending on the type of fault, you may need to visit a
Webasto Service Centre.
1 2 n
A AB
Fig.6 Example fault message
A 5 x green
B “n” x red
7.2 Fuses
The Dual Top ST is equipped with 3 fuses: 5 A, 15 A and 15 A.
Each fuse must be connected to the corresponding cable (ob-
serve colour).
5 A: red-and-blue cable
15 A: red-and-black cable
15 A: red cable
NOTE
Make sure that the Dual Top ST heater is switched off
before you replace a fuse.
8 Disposal
The Dual Top ST must not be disposed of in domestic waste.
Observe the regional regulations for disposal of electronic
products.
9 Warranty and customer
service
1. Online registration of the product:
https://dealers.webasto.com
2. Provide the registration documentation to the next owner
or user of the heater.
Do you have any technical questions or problem with the
device?
National phone numbers of our representatives are provided
on: www.webasto.com
17


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